Many-body physics-induced selection rules: application to Raman spectroscopy

Abstract

Spectroscopic measurements in quantum systems are subject to selection rules, usually based on space-time symmetries, that allow or disallow transitions between states. In many-body systems, in addition to the single-particle states, there emerge new ones due to collective excitations of the system. Here we demonstrate the existence of a "fragile" selection rule that emerges as a manifestation of many-body effects and outlines the conditions for collective excitations to couple to a given spectroscopic probe beyond the usual symmetry considerations. As an example, we apply the rule to Raman spectroscopy of multiband superconductors and settle some unresolved features in experiments.

arXiv comment14 pages, 4 figures; includes supplementary material

References in corpus (30)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• Inelastic Light Scattering From Correlated Electrons
• Superconducting gap symmetry of Ba0.6K0.4Fe2As2 studied by angle-resolved photoemission spectroscopy
• Theory of Anderson pseudospin resonance with Higgs mode in superconductors
• Non-linear optical effects and third-harmonic generation in superconductors: Cooper-pairs vs Higgs mode contribution
• Observation of Leggett's collective mode in a multi-band MgB2 superconductor
• Amplitude Higgs mode and admittance in superconductors with a moving condensate
• Scrutinizing the double superconducting gaps and strong coupling pairing in (Li1-xFexOH)FeSe
• Experimental Demonstration of the Sign Reversal of the Order Parameter in (Li1-xFex)OHFe1-yZnySe
• Infrared activation of the Higgs mode by supercurrent injection in superconducting NbN
• Raman-Scattering Detection of Nearly Degenerate $s$-Wave and $d$-Wave Pairing Channels in Iron-Based Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ and Rb${}_{0.8}$Fe${}_{1.6}$Se${}_2$ Superconductors
• Signature of the Leggett mode in the A1g Raman response: from MgB2 to iron-based superconductors
• A balancing act: Evidence for a strong subdominant d-wave pairing channel in $\mathrm{B}{\mathrm{a}}_{0.6}{\mathrm{K}}_{0.4}\mathrm{F}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$
• Collective modes in superconductors with competing s- and d-wave interactions
• Theory of Raman response in a superconductor with extended s-wave symmetry: Application to Fe-pnictides
• Multiband Electronic Raman Scattering in Bilayer Superconductors
• Collective $d-$wave Excitonic Modes in the Fe-Superconductors
• Theory of Raman scattering from Leggett's collective mode in a multiband superconductor: Application to MgB${}_2$
• Probing the pairing interaction and multiple Bardasis-Schrieffer modes using Raman spectroscopy
• Collective modes in multiband superconductors: Raman scattering in iron selenides
• Conservation laws, vertex corrections, and screening in Raman spectroscopy
• Superconductivity and electronic fluctuations in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ studied by Raman scattering
• Current-assisted Raman activation of the Higgs mode in superconductors
• Raman Study of Cooper Pairing Instabilities in (Li${}_{1-x}$Fe${}_x$)OHFeSe
• $\eta$ collective mode as A${}_{1g}$ Raman resonance in cuprate superconductors
• Fluctuations and pairing in Fe-based superconductors: Light scattering experiments
• Screening of the Raman response in multiband superconductors -- application to iron-pnictides
• On the origin of the A${}_{1g}$ and B${}_{1g}$ electronic Raman scattering peaks in the superconducting state of YBa${}_2$Cu${}_3$O${}_{7-\delta }$
• Superconductivity and fluctuation in Ba${}_{1-p}$K${}_p$Fe${}_2$As${}_2$ and Ba(Fe${}_{1-n}$Co${}_n$)${}_2$As${}_2$

Cited by in corpus (5)

• Linear spectroscopy of collective modes and the gap structure in two-dimensional superconductors
• Electronic Raman response of a superconductor across a time reversal symmetry breaking phase transition
• Electronic Raman scattering from 2D metals with broken inversion symmetry
• Raman response of collective modes in multicomponent superconductors
• Universal nonanalytic features in response functions of anisotropic superconductors